25409389 has 4 divisors (see below), whose sum is σ = 25423740. Its totient is φ = 25395040.

The previous prime is 25409383. The next prime is 25409393. The reversal of 25409389 is 98390452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13264164 + 12145225 = 3642^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 25409389 - 2⁷ = 25409261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25409383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (6355935).

Almost surely, 2^25409389 is an apocalyptic number.

It is an amenable number.

25409389 is a deficient number, since it is larger than the sum of its proper divisors (14351).

25409389 is a wasteful number, since it uses less digits than its factorization.

25409389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14350.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 25409389 is about 5040.7726590276. The cubic root of 25409389 is about 293.9892209169.

The spelling of 25409389 in words is "twenty-five million, four hundred nine thousand, three hundred eighty-nine".